You didn't include a list, so omit anything that doesn't appear in your instructions. Here's structures in order of blood flow:
Superior and inferior vena cava
right atrium
tricuspid valve
right ventricle
pulmonary semilunar valve
pulmonary arteries (2 - one to each lung)
lungs
pulmonary veins (4 - two return from each lung)
left atrium
bicuspid, or mitral valve
left ventricle
aortic semilunar valve
ascending aorta
Molecule, organelle, cell, tissue, organ, organ system, organism, community, population, ecosystem, biosphere
Different forms of a given gene are known as alleles
This is the correct answer.
The probability of two tossed coins will come down as heads is 1/4. Because you have to calculate the probability of 1/2, multiplied with the probability of the other one - 1/2
The name of the structure labeled as A is 'myosin'. Moreover, the name of the structure labeled as B is 'actin'.
A sarcomere is the basic unit of muscle contraction. This unit is defined as the region between two Z-lines.
Band A is a central band composed of the thick filaments of myosin.
Moreover, the sarcomere also has two halves of a band known as I-band, which consists of thin filaments of actin.
Muscle contraction is caused by the interaction between actin and myosin protein filaments in the sarcomeres.
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The answer is letter A) through proteins.